[Bug 81215] [IVB/HSW/BYT/BDW Bisected]Show backtrace when running Synmark2 v6.0 OglTexMem512

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81215

--- Comment #4 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to comment #3)
> Use gdb and grab the symbolic bt for the crash.

Zhoujian, if you haven't done this before, this requires:
- preferably not stripping debug symbols from X server when installing it
  (don't use "strip" command or "-s" argument for "install" command)
- after starting X, attaching to it with Gdb from ssh console
  (display server issues need to be debugged from another machine):
  gdb <your X binary> $(pidof X)
- typing "cont" in Gdb to continue X running
- running the test case under X until X crashes
- in the Gdb prompt after X crash:
  - typing "bt" command to get backtrace,
  - following with few "up" and "info locals" commands
    (type "info locals" after every "up" command)

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